After some research around the SharePoint 2003 issue, I have come to believe that the problem with the RTE error is not the browser but the operating system. I know this might sound strange as it should not affect the operation of SharePoint on the browser. If this is the case, I have seen a number of fixes for this on the internet, they mostly involve a hack. I will test this theory more when I get to work tomorrow (I have been researching from home today)